madsen/cpan-once-a-week-data — pull request #1 by book (2013-02-21 22:12:01+00:00)
Title: add all yearly contests from 1995 on

contests start on the first Sunday of the year and
end on the first Sunday of the following year

the current contest is open-ended so that an activity
percentage of 100% corresponds to the number of elapsed
weeks since the beginning of the contest